Although the use of high rotor speeds is not always necessary, most ultracentrifuges are designed to operate safely at rotor speeds of up to 60,000 or even 100,000 rpm. Despite the use of high speed, the sedimenting forces involved are only small and the technique is extremely gentle, providing a valuable method for the separation of large, labile molecules or [...]
In this article we will discuss about the fixatives, stains and staining schedules used for anatomical studies of plant. Fixatives: A large number of chemicals such as ethyl alcohol, formalin, acetic acid, chloroform, mercuric chloride, chromic acid, picric acid, osmic acid, etc. are used singly or in combinations as fixatives for anatomical studies (For principle of fixation — see Cytology [...]
In this article we will discuss about the procedure for examination of drug materials. A. For Examination of Powder Drugs: The colour, taste solubility and odour of the powder was examined at first. Then a small quantity was mounted in water or glycerine on a clean slide for microscopic examination. Sometimes, lactophenol can be used as mounted for clearing of [...]